Vehicle air brake slack gauge



FIG. 1 is a top, front and left side perspective view of a vehicle air brake slack gauge showing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view;

FIG. 7 is a right side elevational view, the broken line showing of a vertical surface and pipe are environmental only and form no part of the claimed design; and

FIG. 8 is a top, front and left side perspective view thereof, with the scale ruler returned to base position and the pointer ruler shown in use, the broken line showing of a pipe is environmental only and forms no part of the claimed design. 

The ornamental design for a vehicle air brake slack gauge, as shown and described. 